Negative commandment · Lo Ta’aseh #8 of 613
Not to perform the deeds associated with an ov
שלא לעשות מעשה אוב
The verse · Vayikra 19:31
אַל־תִּפְנוּ אֶל־הָאֹבֹת וְאֶל־הַיִּדְּעֹנִים אַל־תְּבַקְשׁוּ לְטׇמְאָה בָהֶם אֲנִי ה׳ אֱלֹהֵיכֶם
“You shall not apply to mediums or wizards, nor seek to be defiled by them: I am the Lord your God.”
The Rambam’s words
Not to perform the deeds associated with an ov, as [Leviticus 19:31] states: "Do not turn to the ovot."
שלא לעשות מעשה אוב, שנאמר "אל תפנו אל האובות" (ויקרא יט,לא).
Why · Sefer HaChinuch #255
To not do an act of ov
“It is from the roots of the commandment [that it is] because these matters are crazy things and total foolishness; and it is not fitting for the holy true people that G-d chose that they pay attention to false words.”
Who & when
“And [it] is practiced in every place and at all times by males and females.”
Where in the Mishneh Torah
Hilchot Foreign Worship and Customs of the Nations הלכות עבודה זרה וחוקות הגויים